Maxim and Progressions - One Clarification

Before attempting to code, I have one question that needs clarification.

“In other words, sequence s can be obtained from the a by deleting some elements.”

Is “some” here necessary? In other words, are the sub-sequences proper subsets meaning that we need to delete AT LEAST one element?

You can deduce the answer to this from the second example case perhaps, but I thought this should be explicitly stated.

Nah, just any subsequence. Sometimes, you see in statements “some (possibly zero)” - usually, “some” is taken to mean “any subset”. If we wanted to nitpick about these things, then elements could imply strictly more than one, too.

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